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I don't know if you would count this as proof but more than one major news outlet was reporting 302/C as a design limit back at the end of March.

"While the maximum vessel temperature set by the reactors’ designers is 302 C degrees, the surface temperature of the No. 1 reactor vessel briefly topped 400 C degrees and dropped to about 350 C degrees by noon, and that of the No. 3 reactor vessel stood at about 305 C degrees, the agency said".

"While the maximum vessel temperature set by the reactors' designers is 302 C degrees, the surface temperature of the No. 1 reactor vessel briefly topped 400 C before dropping to around 305 C by 4 p.m., and that of the No. 3 reactor vessel stood at about 305 C in the morning, the agency said."